One of the unseen problems that exists in the natural
world is the
balance between predators and prey. Many people do not understand that
if there were no predators, plant eating animals would eventually be so
numerous that they would run out of food and die of starvation--a death
far more terrible than the quick death that predators inflict upon
them. If predators are too efficient they can wipe out the plant eaters
that are their prey, and then they would die of starvation themselves.

One of the design features which helps to balance this prey/predator
ratio is the presence of highly designed systems in the prey which
prevent over eating by the predators. Ground squirrels offer a great
example of this, and in California new studies have shown a highly
designed system that prevents their primary enemy, the rattlesnake,
from killing them all off. The rattlesnake has a highly designed system
of its own that helps it find adequate prey. Rattlesnakes have a sensor
in their cheeks which picks up infrared radiation or heat radiation
given off by warmblooded animals. On a totally dark night or in a dark
cave a rattlesnake can see a mouse or other warmblooded prey because it
can see the heat radiation coming from the animal. Man has copied this
system to make infrared scopes which allow night vision, used so
extensively by the United States military.

The problem is that an animal like a ground squirrel could be wiped
out by rattlesnakes if it did not have some method of combating the
infrared abilities the snake has. Scientists studying this relationship
have seen that when a rattlesnake is around ground squirrels, the
squirrels move their tails up and down in a display that is called
flagging. The squirrels will kick sand at the snake and nip at the
snake's tail, but all the while they are doing this the tail is moving
in a wild erratic motion. Studies have shown that when the squirrel
starts the flagging behavior, the tail heats up giving off larger and
larger amounts of infrared radiation. This flooding of the
rattlesnake's infrared sensor is so total that the snake will usually
give up and crawl away.

What is absolutely amazing is that if a gopher snake that does not
have the infrared sensing ability approaches the squirrel, the
squirrel's tail does not heat up. Only when the squirrel is endangered
by snakes with infrared ability does the tail heat up and give off the
flood of infrared signals. Trying to explain how the squirrels can
recognize the type of snake approaching them, and heat up or not heat
up in response, is an incredible challenge if you try to maintain that
it came about by mechanical chance processes. We would suggest that
there is design in the survival equipment of all living things, and
this is a powerful example of the wisdom and design that God has built
into all parts of the natural world.